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Magnetic field effects

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https://www.readbyqxmd.com/read/29149085/the-design-and-characterization-of-a-prototype-wideband-voltage-sensor-based-on-a-resistive-divider
#1
Fernando Garnacho, Abderrahim Khamlichi, Jorge Rovira
The most important advantage of voltage dividers over traditional voltage transformers is that voltage dividers do not have an iron core with non-linear hysteresis characteristics. The voltage dividers have a linear behavior with respect to over-voltages and a flat frequency response larger frequency range. The weak point of a voltage divider is the influence of external high-voltage (HV) and earth parts in its vicinity. Electrical fields arising from high voltages in neighboring phases and from ground conductors and structures are one of their main sources for systematic measurement errors...
November 17, 2017: Sensors
https://www.readbyqxmd.com/read/29149059/a-high-performance-portable-transient-electro-magnetic-sensor-for-unexploded-ordnance-detection
#2
Haofeng Wang, Shudong Chen, Shuang Zhang, Zhiwen Yuan, Haiyang Zhang, Dong Fang, Jun Zhu
Portable transient electromagnetic (TEM) systems can be well adapted to various terrains, including mountainous, woodland, and other complex terrains. They are widely used for the detection of unexploded ordnance (UXO). As the core component of the portable TEM system, the sensor is constructed with a transmitting coil and a receiving coil. Based on the primary field of the transmitting coil and internal noise of the receiving coil, the design and testing of such a sensor is described in detail. Results indicate that the primary field of the transmitting coil depends on the diameter, mass, and power of the coil...
November 17, 2017: Sensors
https://www.readbyqxmd.com/read/29148102/adaptive-integrated-parallel-reception-excitation-and-shimming-ipres-a-with-microelectromechanical-systems-switches
#3
Dean Darnell, Yixin Ma, Hongyuan Wang, Fraser Robb, Allen W Song, Trong-Kha Truong
PURPOSE: Integrated parallel reception, excitation, and shimming coil arrays with N shim loops per radio-frequency (RF) coil element (iPRES(N)) allow an RF current and N direct currents (DC) to flow in each coil element, enabling simultaneous reception/excitation and shimming of highly localized B0 inhomogeneities. The purpose of this work was to reduce the cost and complexity of this design by reducing the number of DC power supplies required by a factor N, while maintaining a high RF and shimming performance...
November 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29146931/a-novel-magnet-actuated-droplet-manipulation-platform-using-a-floating-ferrofluid-film
#4
Chao Yang, Gang Li
In this paper, we propose a novel but versatile magnet-actuated platform for droplet manipulation, which uses a ferrofluid film floating on a liquid surface as magnetic actuator. In contrast to the traditional magnetic droplet manipulation, this platform can handle droplets without magnetically functionalizing them. Due to the immiscibility of the oil-based ferrofluid and water, the droplets desired to be manipulated can stably rest on the surface of the floating ferrofluid film (FFF) under the action of surface tension, thereby offering possibilities for magnetically-driven droplet manipulations...
November 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29146907/giant-magnetic-splitting-inducing-near-unity-valley-polarization-in-van-der-waals-heterostructures
#5
Philipp Nagler, Mariana V Ballottin, Anatolie A Mitioglu, Fabian Mooshammer, Nicola Paradiso, Christoph Strunk, Rupert Huber, Alexey Chernikov, Peter C M Christianen, Christian Schüller, Tobias Korn
Monolayers of semiconducting transition metal dichalcogenides exhibit intriguing fundamental physics of strongly coupled spin and valley degrees of freedom for charge carriers. While the possibility of exploiting these properties for information processing stimulated concerted research activities towards the concept of valleytronics, maintaining control over spin-valley polarization proved challenging in individual monolayers. A promising alternative route explores type II band alignment in artificial van der Waals heterostructures...
November 16, 2017: Nature Communications
https://www.readbyqxmd.com/read/29146806/full-momentum-and-energy-resolved-spectral-function-of-a-2d-electronic-system
#6
Joonho Jang, Heun Mo Yoo, L N Pfeiffer, K W West, K W Baldwin, Raymond C Ashoori
The single-particle spectral function measures the density of electronic states in a material as a function of both momentum and energy, providing central insights into strongly correlated electron phenomena. Here we demonstrate a high-resolution method for measuring the full momentum- and energy-resolved electronic spectral function of a two-dimensional (2D) electronic system embedded in a semiconductor. The technique remains operational in the presence of large externally applied magnetic fields and functions even for electronic systems with zero electrical conductivity or with zero electron density...
November 17, 2017: Science
https://www.readbyqxmd.com/read/29144124/ionic-liquid-microstrips-impregnated-with-magnetic-nano-stirrers-for-sensitive-gas-sensors
#7
Richard Gondosiswanto, David Brynn Hibbert, Yu Fang, Chuan Zhao
Ionic liquids have been regarded as promising electrolytes as substitutes for volatile aqueous or organic solvents for electrochemical gas sensors. However ionic liquids are viscous and the slow diffusion of gas molecules leads to poor sensitivity and sluggish response times. Herein, we describe a strategy using an array of microstrips of ionic liquid containing magnetic nanoparticles as nano-stirrers for enhanced mass transport and gas sensing. Magnetic CoFe2O4 nanoparticles are synthesized and dispersed in a hydrophobic ionic liquid [BMP][Ntf2]...
November 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29143810/next-generation-pacemakers-from-small-devices-to-biological-pacemakers
#8
REVIEW
Eugenio Cingolani, Joshua I Goldhaber, Eduardo Marbán
Electrogenesis in the heart begins in the sinoatrial node and proceeds down the conduction system to originate the heartbeat. Conduction system disorders lead to slow heart rates that are insufficient to support the circulation, necessitating implantation of electronic pacemakers. The typical electronic pacemaker consists of a subcutaneous generator and battery module attached to one or more endocardial leads. New leadless pacemakers can be implanted directly into the right ventricular apex, providing single-chamber pacing without a subcutaneous generator...
November 16, 2017: Nature Reviews. Cardiology
https://www.readbyqxmd.com/read/29141578/nanoparticles-in-drug-delivery-systems
#9
Sandeep Rathor, D C Bhatt, Shaikh Aamir, Hema Chaudhary, Vikash Kumar
Development of effective drug delivery system is important for medicine and healthcare. Nanoparticles (NPs) in medicine have become new revolution in the field of drug delivery system as it helps to overcome the limitations of conventional drug delivery systems. Various nanostructures- including SLSs, liposomes, polymers, dendrimers, NLC, LDC, Magnetic NPs, LLCs, Polymeric nanocrystals, polymeric NPs, and Superparamagnetic NPs, have been tested as a carrier in drug delivery system. The object of this review to covering the delivery of various potential drugs and biomolecules by means of polymeric nanoparticles, dendrimers and magnetic nanoparticles with describing the methods of formulation development...
November 13, 2017: Pharmaceutical Nanotechnology
https://www.readbyqxmd.com/read/29141551/noninvasive-cerebellar-stimulation-as-a-complement-tool-to-pharmacotherapy
#10
Roberta Ferrucci, Tommaso Bocci, Francesca Cortese, Fabiana Ruggiero, Alberto Priori
Cerebellar ataxias represent a wide and heterogeneous group of diseases characterized by balance and coordination disturbance, dysarthria, dyssynergia and adyadococinesia, caused by a dysfunction in the cerebellum. In recent years there has been growing interest in discovering therapeutical strategy for specific forms of cerebellar ataxia. Together with pharmacological studies, there has been growing interest in non-invasive cerebellar stimulation techniques to improve ataxia and limb coordination. Both transcranial magnetic stimulation (TMS) and transcranial direct current stimulation (tDCS) are non-invasive techniques to modulate cerebro and cerebellar cortex excitability using magnetic or electric fields...
November 14, 2017: Current Neuropharmacology
https://www.readbyqxmd.com/read/29141461/development-of-magnetic-anionic-liposome-atelocollagen-complexes-for-efficient-magnetic-drug-targeting
#11
Yusuke Kono, Taketo Nakai, Hitomi Taguchi, Takuya Fujita
Magnetic nanoparticle-incorporated liposomes (magnetic liposomes) are considered a promising site-specific drug delivery carrier vehicle. With regard to their surface charge, magnetic anionic liposomes (Mag-AL) demonstrate little toxicity in comparison with magnetic cationic liposomes (Mag-CL), whereas their cellular association and uptake efficiency are low. In the current study, we constructed complexes of Mag-AL and atelocollagen (ATCOL), which is a biocompatible and minimally immunogenic biomaterial, to improve the cellular uptake properties of Mag-AL in vitro and in vivo...
November 2017: Drug Delivery
https://www.readbyqxmd.com/read/29141190/relationship-between-rtms-effects-and-mep-features-before-rtms
#12
Kazuhisa Nojima, Keiji Iramina
Repetitive transcranial magnetic stimulation (rTMS) is a promising method for use in the clinical field, as it can induce modulation of cortical excitability. Generally, rTMS inhibits the motor cortex when delivered at less than 1Hz. However, it has been indicated that a facilitative effect is induced by 1Hz rTMS, depending on the stimulation parameters and the individual. Therefore, the aim of this study was to investigate the features of the subject that could affect the 1Hz rTMS effect when rTMS stimulus conditions change...
November 12, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/29140796/temperature-and-impurity-effect-on-parallel-field-magnetoconductance-of-bulk-insulating-topological-insulator-bi1-x-sb-x-2te3
#13
R R Urkude, R Rawat, U A Palikundwar
We have performed a systematic parallel field magnetotransport studies of (Bi1-x Sb x )2Te3 to understand the temperature and impurity effect on the interference of bulk conductance on the surface states of highly insulating topologically insulating compound Bi2Te3. The compound exhibits a weak antilocalization effect (WAL) at low temperature and low magnetic field. WAL weakens and a weak localization effect is observed to be developed in the compound with the increase in temperature due to the creation of topologically trivial 2D electron gas states...
November 15, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29140360/ultracompact-high-extinction-ratio-polarization-beam-splitter-rotator-based-on-hybrid-plasmonic-dielectric-directional-coupling
#14
Bowen Bai, Lu Liu, Zhiping Zhou
A polarization beam splitter-rotator based on asymmetric directional coupling is proposed. An ultrashort cross-polarization coupling length of 7.7 μm is achieved by manipulating the optical field distribution via the plasmonic effect, which is the shortest one reported so far, to the best of our knowledge. At the wavelength of 1.55 μm, the extinction ratios are as high as 50.9 dB and 28.2 dB for fundamental transverse magnetic (TM0) and transverse electric (TE0) polarizations, respectively, and the corresponding insertion losses are 1...
November 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/29139510/crystal-structures-and-magnetic-properties-of-two-series-of-phenoxo-o-bridged-dinuclear-ln2-ln-gd-tb-dy-complexes
#15
Marek Machata, Radovan Herchel, Ivan Nemec, Zdeněk Trávníček
Six dinuclear lanthanide compounds of the formulae [Ln2(3m-L4)2(L2)2(MeOH)2]·6MeOH (Ln = Gd - 1a, Tb - 1b, and Dy - 1c) and [Ln2(3m-L4)2(L2)2(DMF)2] (Ln = Gd - 2a, Tb - 2b, and Dy - 2c; DMF = N,N-dimethylformamide, H23m-L4 = (2-[(E)-(3-metoxysalicylidene)amino]phenol), and HL2 = 1,3-diphenyl-1,3-diketopropane) were prepared and characterized by elemental analysis, FTIR spectroscopy, thermogravimetric measurements, single-crystal X-ray structural analysis, and magnetometry, and Gd2 and Dy2 compounds by ab initio methods as well...
November 15, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29139497/weak-ferromagnetic-ordering-in-brownmillerite-ca2fe2o5-and-its-effect-on-electric-field-gradients
#16
Isao Kagomiya, Yuki Hirota, Ken-Ichi Kakimoto, Kotaro Fujii, Masahiro Shiraiwa, Masatomo Yashima, Akio Fuwa, Shin Nakamura
Brownmillerite Ca2Fe2O5 (CFO) exhibits a magnetic transition at TN ∼ 730 K. Many studies have reported the magnetic properties of CFO. However, the magnetic structure of CFO is still debated, i.e., whether the magnetic ordering is purely antiferromagnetic or weakly ferromagnetic, which originated from canted magnetic moments. In addition, the reason for the CFO showing large magnetoresistance is still unclear. This study attempts to address the unresolved issues stated above by multiple investigations on the crystal structure, magnetization, and Mössbauer parameters...
November 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29139294/improved-electrostatic-embedding-for-fragment-based-chemical-shift-calculations-in-molecular-crystals
#17
Joshua D Hartman, Ashwin Balaji, Gregory J O Beran
Fragment-based methods predict nuclear magnetic resonance (NMR) chemical shielding tensors in molecular crystals with high accuracy and computational efficiency. Such methods typically employ electrostatic embedding to mimic the crystalline environment, and the quality of the results can be sensitive to the embedding treatment. To improve the quality of this embedding environment for fragment-based molecular crystal property calculations, we borrow ideas from the embedded ion method to incorporate self-consistently polarized Madelung field effects...
November 15, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/29138559/human-mesenchymal-stem-cell-derived-iron-oxide-exosomes-allow-targeted-ablation-of-tumor-cells-via-magnetic-hyperthermia
#18
U Altanerova, M Babincova, P Babinec, K Benejova, J Jakubechova, V Altanerova, M Zduriencikova, V Repiska, C Altaner
Magnetic hyperthermia, or the heating of tissues using magnetic materials, is a promising approach for treating cancer. We found that human mesenchymal stem cells (MSCs) isolated from various tissues and MSCs expressing the yeast cytosine deaminase∷uracil phosphoribosyl transferase suicide fusion gene (yCD∷UPRT) can be labeled with Venofer, an iron oxide carbohydrate nanoparticle. Venofer labeling did not affect cell proliferation or the ability to home to tumors. All Venofer-labeled MSCs released exosomes that contained iron oxide...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29137989/does-tms-on-v3-block-conscious-visual-perception
#19
Niina Salminen-Vaparanta, Mika Koivisto, Victor Vorobyev, Kati Alakurtti, Antti Revonsuo
Primary visual cortex (V1) and extrastriate V2 are necessary for the emergence of visual consciousness, but the effects of involvement of extrastriate V3 on visual consciousness is unclear. The objective of this study was to examine the causal role of V3 in visual consciousness in humans. We combined neuronavigated transcranial magnetic stimulation (TMS) with a computational model of the TMS-induced electric field to test whether or not the intact processing of visual input in V3, like in V1 and V2, is necessary for conscious visual perception...
November 11, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/29137198/water-based-suspensions-of-iron-oxide-nanoparticles-with-electrostatic-or-steric-stabilization-by-chitosan-fabrication-characterization-and-biocompatibility
#20
Galina V Kurlyandskaya, Larisa S Litvinova, Alexander P Safronov, Valeria V Schupletsova, Irina S Tyukova, Olga G Khaziakhmatova, Galina B Slepchenko, Kristina A Yurova, Elena G Cherempey, Nikita A Kulesh, Ricardo Andrade, Igor V Beketov, Igor A Khlusov
Present day biomedical applications, including magnetic biosensing, demand better understanding of the interactions between living systems and magnetic nanoparticles (MNPs). In this work spherical MNPs of maghemite were obtained by a highly productive laser target evaporation technique. XRD analysis confirmed the inverse spinel structure of the MNPs (space group Fd-3m). The ensemble obeyed a lognormal size distribution with the median value 26.8 nm and dispersion 0.362. Stabilized water-based suspensions were fabricated using electrostatic or steric stabilization by the natural polymer chitosan...
November 13, 2017: Sensors
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